Computational Model For Particle Deposition In
Turbulent Gas Flows For CFD Codes
Author(s)
M. C. Paz, J. Porteiro, A. Eirís & E. Suárez
Abstract
A numerical simulation procedure was developed in FLUENT code in order to
study particle deposition in diluted turbulent gas flows in ducts. A hybrid
Eulerian–Lagrangian model was used to evaluate the gas flow and temperature
profile as well as particle dispersion and deposition. The mean flow velocity and
temperature fields were generated by a Reynolds Average Navier Stokes
(RANS) method, using the Reynolds Stress Model (RSM) available in FLUENT.
The instantaneous turbulent velocity fluctuation and Brownian force were
simulated by a continuous Gaussian random field as a white-noise process
respectively. In the particle equation of motion, Brownian diffusion, Saffman
lift, Stokes drag and gravity were included. In order to evaluate the deposition
model, particles with diameter ranges from 1nm to 50 μm, and different velocity
fields were studied. The numerical results obtained under isothermal conditions
were compared with the available experimental data, with empirical correlations,
and earlier published simulation results. In all cases, an acceptable agreement
was observed. The importance of each of the deposition forces included is
discussed in this work.
The reasonable computational cost of this methodology enables us to study
particle deposition in complex geometries, different from smooth surfaces. The
results presented provide guidelines to develop an extended computational
fouling model in heat exchange surfaces.
Keywords: particles deposition, exhaust gas, fouling, CFD.
1 Introduction
Particle deposition is of critical importance in numerous industrial applications,
filtration, microchip manufacture, atmospheric pollutant control, combustion and
Keywords
particles deposition, exhaust gas, fouling, CFD
Related Book
Other papers in this volume
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